// 实现这个项目的构建任务
const { src, dest, parallel, series, watch } = require('gulp')
const del = require('del');
const browserSync = require('browser-sync')

const loadPlugins = require('gulp-load-plugins')
const plugins = loadPlugins()

const data = {
  menus: [
    {
      name: 'Home',
      icon: 'aperture',
      link: 'index.html'
    },
    {
      name: 'Features',
      link: 'features.html'
    },
    {
      name: 'About',
      link: 'about.html'
    },
    {
      name: 'Contact',
      link: '#',
      children: [
        {
          name: 'Twitter',
          link: 'https://twitter.com/w_zce'
        },
        {
          name: 'About',
          link: 'https://weibo.com/zceme'
        },
        {
          name: 'divider'
        },
        {
          name: 'About',
          link: 'https://github.com/zce'
        }
      ]
    }
  ],
  pkg: require('./package.json'),
  date: new Date()
}

//style构建
const style = () => {
  return src('src/assets/styles/*.scss', { base: 'src' })
    .pipe(plugins.sass({ outputStyle: 'expanded' }))
    .pipe(dest('temp'))
    .pipe(bs.reload({ stream: true }))
}
//script构建
const script = () => {
  return src('src/assets/scripts/*.js', { base: 'src' })
    .pipe(plugins.babel({ presets: ['@babel/preset-env'] }))
    .pipe(dest('temp'))
    .pipe(bs.reload({ stream: true }))
}
//page构建
const page = () => {
  return src('src/*.html', { base: 'src' })
    .pipe(plugins.swig({ data, defaults: { caches: false } }))
    .pipe(dest('temp'))
    .pipe(bs.reload({ stream: true }))
}
//image构建
const img = () => {
  return src('src/assets/images/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('temp'))
}
//font构建
const font = () => {
  return src('src/assets/fonts/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('temp'))
}
//构建其他文件
const extra = () => {
  return src('public/**', { base: 'public' })
    .pipe(dest('temp'))
}
//清除构建
const clean = () => {
  return del('temp')
}
//搭建开发服务器
const bs = browserSync.create()
const serve = () => {
  watch('src/assets/styles/*.scss', style)
  watch('src/assets/scripts/*.js', script)
  watch('src/assets/*.html', page)
  watch(['src/assets/images/**', 'src/assets/fonts/**', 'public/**'], bs.reload)
  bs.init({
    notify: false,
    port: 2080,
    server: {
      baseDir: ['temp', 'src', 'public'],
      routes: {
        '/node_modules': 'node_modules'
      }
    }
  })
}
//注释构建
const useref = () => {
  return src('temp/*.html', { base: 'temp' })
    .pipe(plugins.useref({ searchPath: ['temp', '.'] }))
    .pipe(plugins.if(/\.js$/, plugins.uglify()))
    .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
    .pipe(plugins.if(/\.html/, plugins.htmlmin({
      collapseWhitespace: true,
      minifyCSS: true,
      minifyJS: true
     })))
     .pipe(dest('dist'))
}

const compit = parallel(page, style, script)
const build = series(clean, parallel(series(compit, useref), img, font, extra))
const start = series(compit, serve)
module.exports = { clean, build, serve, start }
